diff --git a/modules/ripple_app/node/ripple_KeyvaDBBackendFactory.cpp b/modules/ripple_app/node/ripple_KeyvaDBBackendFactory.cpp
index 8b08c87d41..63edfab516 100644
--- a/modules/ripple_app/node/ripple_KeyvaDBBackendFactory.cpp
+++ b/modules/ripple_app/node/ripple_KeyvaDBBackendFactory.cpp
@@ -116,7 +116,7 @@ public:
 
     void storeBatch (NodeStore::Batch const& batch)
     {
-        for (int i = 0; i < batch.size (); ++i)
+        for (std::size_t i = 0; i < batch.size (); ++i)
             store (batch [i]);
     }
 
diff --git a/modules/ripple_app/node/ripple_MemoryBackendFactory.cpp b/modules/ripple_app/node/ripple_MemoryBackendFactory.cpp
index c0b665473f..21920845a3 100644
--- a/modules/ripple_app/node/ripple_MemoryBackendFactory.cpp
+++ b/modules/ripple_app/node/ripple_MemoryBackendFactory.cpp
@@ -56,7 +56,7 @@ public:
 
     void storeBatch (NodeStore::Batch const& batch)
     {
-        for (int i = 0; i < batch.size (); ++i)
+        for (std::size_t i = 0; i < batch.size (); ++i)
             store (batch [i]);
     }